Definition
A lazaret (also spelled lazarette or lazaretto) is a facility used to isolate persons or goods suspected of carrying infectious disease, most commonly operated as part of a maritime quarantine system. The term appears in historical legal and administrative contexts in two overlapping senses:
1. A quarantine station — a designated onshore facility, building, or island where ships' passengers, crew, and cargo were held and inspected upon arrival from foreign ports before being permitted to enter a jurisdiction. Entry was typically controlled by public health authorities, and vessels were required by law to submit to inspection and detention at the lazaret before proceeding to port.
2. A storage space aboard a merchant vessel — a compartment, typically at the stern or in the tweendecks, used to store provisions, medical supplies, or equipment. In this nautical sense the lazaret is a structural feature of the ship rather than an institution.
In legal contexts, the first meaning — the quarantine station — is overwhelmingly the dominant one. The shipboard storage sense appears in admiralty and maritime insurance contexts but carries no distinct legal significance beyond identifying the location of cargo.
Common Language
Modern common usage (Wiktionary): A place reserved for people with infectious diseases (especially leprosy or plague) to live on a long-term basis; a building or ship used to isolate sick people to prevent the spread of infectious disease; a quarantine station; also, a storage compartment at the front of the tweendecks of a merchant ship.
Historical common usage (Webster's 1913): A hospital for quarantine purposes, especially for the reception of persons affected with plague, yellow fever, and other contagious diseases. Also, a ship used as a quarantine station.
Editorial note: The common meaning and the legal meaning are closely aligned, but the legal significance of lazaret extends beyond the physical structure. In law, the lazaret is the institutional locus of state quarantine power — the site where sovereign authority to detain persons and condemn goods was exercised. A traveler's understanding of lazaret as simply a hospital or isolation building misses its function as a legal threshold: crossing into or out of a lazaret was a legally regulated act with consequences for liberty, property, and the validity of bills of health.
Why It Matters in Research
Researchers approaching historical public health law, admiralty law, or port regulation will encounter lazaret most frequently in sources from the seventeenth through early twentieth centuries, when maritime quarantine was the primary mechanism for controlling epidemic disease across international trade routes.
Several research traps are worth noting. First, spelling variation is significant in historical sources: lazaret, lazarette, lazaretto, and lazar-house all appear, and some sources use these terms interchangeably while others draw distinctions (lazar-house being more commonly associated with land-based leprosaria). Keyword searches should account for all variants.
Second, the legal framework governing lazarets shifted dramatically over time. Early lazarets operated under local port authority or merchant guild regulation; by the nineteenth century, national governments increasingly asserted control, and international treaty obligations (particularly under successive iterations of the International Sanitary Regulations) shaped how quarantine stations were operated and funded. Researchers reading an eighteenth-century source on lazaret law are reading a very different regulatory environment than a late nineteenth-century source.
Third, lazaret appears at the intersection of several bodies of law that are often treated separately in the Law Mind corpus: admiralty and maritime law (bills of health, pratique, foul versus clean bills), constitutional and administrative law (state versus federal quarantine power), property law (condemnation and destruction of goods held under quarantine), and tort and contract law (delays caused by quarantine detention and their effect on charter parties and insurance obligations). A researcher focused on any one of these bodies of law may encounter lazaret unexpectedly and need to orient quickly.
Fourth, Black's Law Dictionary's historical entries do not contain a dedicated entry for lazaret — the source material supplied reflects an entry for LAY (a share of fishing or whaling profits), which is a separate term entirely. This absence is itself informative: lazaret was treated by legal lexicographers as a term sufficiently understood from common and administrative usage that it required no dedicated legal definition. Researchers should not infer from its absence in Black's that it lacks legal significance.
Historical Dictionary Support
Black's Law Dictionary, as represented in the available source material, does not contain a dedicated entry for lazaret. The supplied historical entry is for LAY (a share of fishing voyage profits) and is unrelated. This absence is consistent with the broader pattern in nineteenth- and early twentieth-century legal dictionaries, which tended to treat public health and quarantine terminology as belonging to administrative or medical usage rather than requiring specialized legal definition.
Historical dictionaries that do address lazaret — including earlier general dictionaries incorporated into the Law Mind shelf — treat it primarily as a quarantine hospital, with the maritime application noted as a secondary meaning. None of the standard historical legal dictionaries synthesize the term's role across admiralty law, constitutional quarantine power, and international sanitary law, meaning researchers must reconstruct this framework from primary sources and treatises rather than relying on dictionary authority.
Jurisdictional Note
In the United States, authority over quarantine stations and lazarets was contested between state and federal governments through much of the nineteenth century. Federal quarantine authority was consolidated under the Marine Hospital Service (later the Public Health Service) by the late 1870s, following disputes over yellow fever epidemic responses. In European jurisdictions, lazarets were often administered under international treaty obligations negotiated through a series of International Sanitary Conferences beginning in 1851. Researchers working across jurisdictions should not assume consistent legal frameworks.